Thermostatic head



FIG. 1 is a rear view of a thermostatic head comprising a new, original and ornamental design;

FIG. 2 is a front view of a thermostatic head comprising the new, original and ornamental design;

FIG. 3 is a left-hand side view of a thermostatic head comprising the new, original and ornamental design;

FIG. 4 is a top, rear, right-hand side perspective view of a thermostatic head comprising the new, original and ornamental design;

FIG. 5 is a right-hand side view of a thermostatic head comprising the new, original and ornamental design; and,

FIG. 6 is a top view of a thermostatic head comprising the new, original and ornamental design.

No claim is made to the bottom view, which is omitted from the drawings. 

The ornamental design for a thermostatic head, substantially as shown and described. 